688480687 has 2 divisors, whose sum is σ = 688480688. Its totient is φ = 688480686.

The previous prime is 688480679. The next prime is 688480699. The reversal of 688480687 is 786084886.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 688480687 - 2³ = 688480679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (688480657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344240343 + 344240344.

It is an arithmetic number, because the mean of its divisors is an integer number (344240344).

Almost surely, 2^688480687 is an apocalyptic number.

688480687 is a deficient number, since it is larger than the sum of its proper divisors (1).

688480687 is an equidigital number, since it uses as much as digits as its factorization.

688480687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4128768, while the sum is 55.

The square root of 688480687 is about 26238.9155073147. The cubic root of 688480687 is about 883.0065410211.

It can be divided in two parts, 6884 and 80687, that added together give a triangular number (87571 = T₄₁₈).

The spelling of 688480687 in words is "six hundred eighty-eight million, four hundred eighty thousand, six hundred eighty-seven".